from (η5-C5H5)Re(NO)(PPh3)(OTf). Complexes 2b–2d+X− and 3b–3d+X− can exist as two Re, S configurational diastereomers. Stereochemistry is assigned from reactions of (S)- or (R)-1+BF4− with enantiomerically enriched sulfoxides (R)-b–d, and a crystal structure of (SReRS,RReSS)-2d+TfO−·0.5CH2Cl2. Relative diastereomer stabilities, and the basis for the divergent kinetic and thermodynamic oxygen/sulfur
手性的反应
氯苯配合物[(η 5 -C 5 H ^ 5)的Re(NO)(PPH 3)(CLC 6 ħ 5)] + BF 4 - (1 + BF 4 - )和烷基甲基亚砜ö S(Me)的R(R = 一个中,Me; b,等; ç,我-Pr或d,吨-Bu),在-15℃下,得到与氧结合的亚砜配合物[(η 5 -C 5 H ^ 5)的Re(NO)(PPH 3)(O S(Me)R)] +
BF4 −( 2a–2d + BF 4 −; 94–56%)。高于0℃, 2A-2D + BF 4 -重排以
硫结合的联动异构体[(η 5 -C 5 H ^ 5)的Re(NO)(PPH 3)(小号(O)(Me)的R)] + BF 4 −( 3a – 3d + BF 4 −; 96–20%)。
三氟甲磺酸酯的盐2C, 2D + TFO -和图3b,图3c + TFO-类似地由(η 5 -C 5 H ^ 5)的Re(NO)(PPH